The BBC was found to have committed a "significant breach" of media regulations by failing to disclose that the voice of a programme about the Gaza situation was the son of a Hamas official, according to British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a significant failing in relation to accuracy".
Ofcom has ordered the BBC to broadcast a prime-time announcement about its conclusions.
"As this represents a serious breach of our code, we are ordering the corporation to broadcast a statement of our conclusions against it on the BBC's second channel at 9pm, with a schedule to be confirmed," it said.
'Potential to Erode Credibility'
The authority's report declared: "The inquiry we conducted determined that the film's omission to reveal that the presenter's male guardian held a post in the Hamas-controlled government was significantly deceptive.
"Consequently that the audience did not have critical information which may have been very significant to their assessment of the narrator and the information he shared.
"Credibility is at the center of the bond between a broadcaster and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the very considerable levels of credibility that the public would have put in a BBC factual programme about the Gaza conflict."
The documentary was removed from the online platform in the month of February after the boy's family links were revealed, and in this past July an corporation's own inquiry found it breached the organization's content policies on factual correctness.
A corporation official said: "The authority's determination is in line with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept the authority's determination in full. We will follow the sanction as soon as the schedule and language are confirmed."
